Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 40 for “"fdd"”.
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Wide band TX Leakage Cancellation for FDD Transceivers
Frequency division duplex (FDD) is the most widely used full duplex technique for modern wireless communication systems. A device called a duplexer is needed in order to separate the transmitter (TX) and the receiver (RX) signals. To avoid RX being saturated and desensitized, the isolation between …
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Channel Estimation in TDD and FDD-Based Massive MIMO Systems
… estimation for frequency-division-duplex (FDD) massive MIMO systems. Acquiring downlink channel state information in these systems is challenging due to the large training and feedback overhead. Motivated by the partial reciprocity of uplink and downlink channels, we first estimate the …
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Channel Estimation Overhead Reduction for Downlink FDD Massive MIMO Systems
… cellular networks. Frequency-division duplexing (FDD) massive MIMO systems in the downlink (DL) suffer significantly from the channel estimation overhead. In this thesis, we propose a minimum mean square error (MMSE)-based channel estimation framework that exploits the spatial correlation between …
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INVESTIGATION OF STRATEGIES FOR IMPROVING THE PERFORMANCE OF SMART THERMOSTAT-DRIVEN FDD METHODS
… thermostat-driven fault detection and diagnosis (FDD) methods that are intended for vapor compression air conditioning (AC) systems in residential homes. Though there have been some research efforts within the last decade on smart thermostat-driven FDD, there are several challenges which have …
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Integrated Wideband Self-Interference Cancellation Techniques for FDD and Full-Duplex Wireless Communication
The continued demand for higher levels of wireless access and increased data rates for a variety of applications from mobile smart phones to back haul point-to-point communication, continues to drive research that enables new spectrum opportunities, reduces form factor and lowers the cost of …
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Signalakquisition in DS-Spreizspektrum-Systemen und ihre Anwendung auf den 3GPP-FDD-Mobilfunkstandard
… followed by an extensive discussion of the 3GPP FDD downlink acquisition procedure as an example of a multi stage procedure with distributed information conclude the work.
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Adaptable, scalable, probabilistic fault detection and diagnostic methods for the HVAC secondary system
… data. However, the current constraints prevent FDD technology from being widely accepted, which include: 1)Difficult to understand the diagnostic results; 2)FDD methods have strong system dependency and low adaptability; 3)The performance of FDD methods is still not satisfactory; 4)Lack of …
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Development of methodologies for evaluating performance of fault detection and diagnostics protocols applied to unitary air-conditioning equipment
… performance of fault detection and diagnostics (FDD) protocols that are intended for air-cooled vapor compression unitary air-conditioners. Although there are currently many FDD protocols available commercially and there are jurisdictions in which the building codes require FDD, there is …
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Insights on an automated fall detection device designed for older adult wheelchair and scooter users: a qualitative study
… perceived usefulness of a fall detection device (FDD) among 15 older adults who use wheelchairs and scooters through remote semi-structured interviews. Participants (mean age: 67.5 4.7 years) lived with a variety of disabilities including multiple sclerosis, cerebral palsy, spinal cord injury, …
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A Deep Learning Solution for Fault Detection and Diagnosis Applied to Internal Combustion Engines
… more precisely Fault Detection and Diagnosis (FDD) are aimed at addressing that attention for increased customer satisfaction. The economic implications of FDD are highly valued in the industry, and academia is leveraged to provide smart responses. The focus of this research is the development …
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Ambient vibration testing of concrete dams
… exponential, frequency domain decomposition (FDD) based techniques which include; frequency domain decomposition (FDD), enhanced frequency domain decomposition (EFDD), curve fitting frequency domain decomposition (CFDD) and stochastic subspace identification (SSI) methods namely; unweighted …
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Fault detection and diagnosis : application in microelectromechanical systems
… development of a fault detection and diagnosis (FDD) procedure capable of capturing, isolating and identifying multiple abrupt parametric faults. The proposed method relies on parameter estimation deployed in a set membership framework. This approach presupposes the utilization of a linearly …
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Characterization of the A/B regulon in tobacco (Nicotiana tabacum)
… procedure, fluorescent differential display (FDD), was used to screen total RNA isolated from Burley 21 (WT, AABB) and LA21 (low alkaloid regulatory mutant, aabb) tobacco root cultures that were induced for alkaloid synthesis. Four of thirteen cloned FDD fragments showed sequence homology to …
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Orthogonal Factors of Operators on the Rosenthal Spaces and the Bourgain-Rosenthal-Schechtman Spaces
… to a scalar finite-dimensional decomposition (FDD)-diagonal operator, the construction is significantly more involved than in the case $\alpha = \omega$. For every $1 \leq \alpha < \omega_1$, we construct an explicit unconditional FDD $(X_\lambda)_{\lambda \in \mathcal{T}_\alpha}$ of the …
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Simulation Study of Local Multipoint Distribution Service
… (TDD), and Frequency Division Duplexing (FDD). For the system under study, it was observed that TDMA results in lower end-to-end (ETE) delay per packet, but higher jitter, than FDMA. In addition, TDD results in lower ETE delay per packet than FDD. Specifically, TDMA in conjunction with TDD …
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Fault Detection And Diagnosis For Air Conditioners And Heat Pumps Based On Virtual Sensors
… Automated fault detection and diagnostics (FDD) has the potential for improving energy efficiency along with reducing service costs and comfort complaints. To achieve this goal, virtual sensors with low cost measurements and simple models were developed to estimate quantities that would be …
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A load identification and diagnostic framework for aggregate power monitoring
… space for fault detection and diagnostics (FDD). However, mainstream machine learning methods may overlook potential features with key physical context in the development of soft faults due to a lack of faulty load data in publicly available datasets. Therefore, a physically informed feature …
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Whose fault is it anyway? evaluating the energy efficiency gap in commercial buildings & measuring energy savings associated with fault detection and diagnostics
… new field of fault detection and diagnostics (FDD). With FDD, building owners are able to closely monitor on an ongoing basis any faults that begin to occur in a commercial building that can waste energy and lead to the gap in energy efficiency. However, there has been very little research …
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Improving the Use of Mobile Medical Alert Devices in the Elderly
… & Klickstein, 2016). Fall detection devices (FDD) send an alert to summon the assistance of a telephone responder; who notifies family and emergency services to prevent fall from becoming a catastrophe (Feldwiser, 2016). Purpose The purpose of this DNP quality improvement (QI) project is to …
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Observer based active fault tolerant control of descriptor systems
… provided by fault detection and fault diagnosis (FDD) or fault estimation (FE) systems offering an opportunity to improve the safety, reliability and survivability for complex modern systems. However, in the majority of the literature the roles of FDD/FE and reconfigurable control are described as …
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